FIGURE 1. Average Annual Precipitation Based on 1981–2010 Normals National Oceanic and Atmospheric Administration. (NOAA). 2016. Average annual precipitation based on 1981–2010 normals. NOAA National Centers for Environmental Information.
FIGURE 3. Figure 3. Dominant Soil Orders of the United States. USDA Natural Resources Conservation Service (NRCS). 1998. Dominant Soil Orders of the United States. USDA NRCS National Soil Survey Center: Lincoln, NE.